While I was rooting about in my computer, looking for some files, I managed to find a couple of Nixie chapters from one of the storylines featuring her. This particular storyline featured other inflatable animals as well: Moondepths, a hippocampus; Prosperity, a kirin; Starchaser, a hippogryph; and Raptera and Azuren, a raptor and dragon, respectively.

Oof the top of my head, Moonchaser and Prosperity belonged to  Cetas, and I was the one who came up with Raptera and Azuren. No idea which of us came up with Starchaser.

In this storyline, the sheer growth of Nixie and Starchaser busted apart the house of the main character - which in this storyline is far more remote than in the other Nixie snippets that got posted - flinging several inflatable toys into the nearby forest. After retrieving them, well... Things get growy.

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You grip your chest and take in a few deep breaths, pounding heart slowing down somewhat. The sound of squeaking rubber seems to be omnipresent, and it has become so dark that you can barely see more than a few feet in front of you. Gulping, you come out from behind the tree you had been hiding behind, and, step by unsteady step, begin to move back out of the forest and to the plain where your house had once stood.

Timidly peeking out of the forest, you swallow again, taking one step, then another. The sounds of squeaking latex still fill the air, but it's different this time, somehow - less stretching rubber, and more rubber being smooshed and squished together. Creeping forward, you nervously look upwards every few seconds, setting sun entirely blotted out by groaning, creaking, massive latex bodies.

Just then, an extraordinarily bright beam of light blinds you, and you cover your eyes with your hands. Up above, you can hear Prosperity speaking, and her voice is so much louder than before; "Sorry, Owner, I didn't think that it would be that bright... Is this okay?" And with that, the light's intensity lowers, until you can clearly see the six inflatables - and they're HUGE! Arrayed before you in a tight semi-circle, sides pushing and squeaking into each other, the inflatables tower hundreds of feet into the air, looking high over the landscape with little effort. The glow from Prosperity's golden horn-tip dims, providing just enough light for you to see all of them, but not enough to hurt your eyes should directly at it. The Kirin herself has grown to the same degree as the rest of them, and wears a partly-guilty, partly-apologetic, and partly-excited look on her rubber muzzle.

Raptera and Azuren have grown as well, swelling up far past the comparatively meager sizes that dinosaurs and dragons are assigned in fiction, rivaling Nixie and Starchaser in size! Azuren's wings stretch high into the air, twitching every so often out of some impulse to fly. Every inflatable tail swishes back and forth in poorly-restrained joy, and you notice that Nixie's tongue is poking way out of her muzzle, like how a cat or dog's tongue sometimes would. The Nightmare is still blushing a dark crimson, eyes screwed up and muzzle smiling joyfully. It seems merely being big feels good to Nixie. Not that you expect her to stop growing, now that there's no real way for you to stop her from doing so.

"Uh, h-hey, girls..." you stutter out, looking way, way up at the inflatables. Most look about ready to launch themselves at you for cuddles, despite the size disparity. Nixie is the first to actually do so, multi-dozen foot high muzzle towering over you with trivial ease. Somewhat awkwardly, you give the small section of her chin that you can reach a hug, and she wriggles about in joy as you do so, kicking her back legs and snorting gleefully. Shuddering ever so slightly, the Nightmare gets back up, retreating back to the group, a dark blush on her cheeks once more, and...

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Nixie pauses mid-stride, squeaky body suddenly coming to a halt - to the point that the massive Nightmare nearly toppled forwards because of the inertia! Tingling and twitching, Nixie recognizes what's about to happen, and her tongue happily lolls out, as she takes in a big huff, rubber hide squeaking again...

"Mmm... Bigger!" The Nightmare rumbles, unaware that the other inflatables - who she is now a head taller than - are very quietly backing away from her. "BIGGER!" She cries, hide stretching slowly but surely, her body seemingly having to grow larger before it can handle the coming growth spurt!

And then, it happens. With a deafening whinny, Nixie rears up on her two hind legs, tails swishing this was and that, rump pushing outwards, and bulges another ten feet bigger on the spot! Quickly swelling up over the other toys, latex skin stretching with a deafening squeal, she pants for all her worth, tongue suddenly inflating so large it fills her mouth, before the rest of her body catches up, almost doubling in size in an instant! The rapidly inflating Nightmare comes crashing back down onto all fours with a n impact that shakes the ground - so much so that not only do you fall over, but so do the other inflatables! Nixie's bulging silver hooves pump thicker, longer, wider, beginning to smoosh into the other inflatables as she surges up another fifty feet - then another fifty, beginning to carry them along with her growth alone!

"BIGGER, BIGGER! MMM, ALWAYS BIGGER!" Nixie chants, horn rising higher with every breath, with every motion of her surging, squeaking body. Wriggling about, the Nightmare huffs, feeling her hooves push into you and the other inflatables, pushing you back with trivial ease! Her blazing orange tail whipping about casts warm light all over the area, illuminating her shiny hide - which, with a heaving sigh, stretches even larger and thicker!

Taking in one, long, continuous breath, Nixie pumps even bigger, casting a shower that engulfs the scrambling and fleeing inflatables! You yourself are stuck to her hide; though you have managed to climb a fair distance, Nixie's endless growth renders almost all of your progress meaningless! Nickering, Nixie nips the back of your clothes with her faux-teeth, depositing you on top of a massive, squishy rump cheek. Stumbling towards her head ever so slowly, you watch as her tail swells up even larger, swishing about before her rump balloons up as well, launching you into the air, before the rest of her follows suit, growing so fast that her expanding rump catches you from underneath by doing nothing more than growing!

Nixie's growth sends deafening squeaks out in ever direction - but are the squeaks only her's? As the growth-hungry latex inflatable chants again - "BIGGER! BBIIIIIIGGGEEER!" - you swear you can hear squeaking from the other inflatables - but how quickly are they growing?